I have a 2 to 3 months old seedling of laburnum. Could I leave it outside on my (very) windy balcony (I could bury it with it's pot in a container, but still very exposed to the elements) or would it be better to store it in a cold room (8-10 degrees C) inside the house?

I'm not an expert on laburnum, but I do know that wind is usually more harmful than just the temperature. But your cold room might be too warm for the tree to stay dormant. Can you protect from the worst wind?